Sewing-machine.



S. BURTON, DEOD. c. P. BOBTON, ADMINISTRATRIX.

SEWING MACHINE.

APPLICATION FILED JUNE 18, 1907. RENEWED AUG.1, 1912.

1,041,586. b Patented Oct. 15, 1912.

. r. as STATES wsrsr onnlsrms P. son'ron, or wsnwIcm-nnonn Ismrm,anmmsrnarsrx or successor: non-son, :oncnasnn, AssmNon so wrmcoz: aarses snwme MACHINE company, on NEW roan, 1s. m, A oonsonnrron or new201m.

SEWINGJJACHENE.

menses.

Specification of Letters Patent.

Patented Get. 15,1012.

original application flied December 13, 1906, Serial No. 847,659.Divided and this application filed June 18, 1907, Serial No. 379,655;Renewed August 1, 1912. Serial No. 712,768.

To all whom it may concern:

Be it known that STOCKTON Bon'roN, deceased, late a citizen of theUnited States, and resident of the town of Warwick, county of Kent Stateof Rhode Island, did invent new and useful Improvements in Sewing-Machines, fully set forth in the following spccificat1on.

The'present invention relates to a sewingmachine especiail designed toproduce, by

one operation an at high spec (meaning that each needle shall be capableof making approximately three thousand or more stitches per minute), acomplete seam of special form for joining two abutting edges of cut-knitgoods.v

This i a divisionof his application for United States Letters-Patentiilcd Dec. 13, mos, Sr. No. 347,649.

The present invention is particularly directed to improvements inthread-cutters, constituting permanent parts of the mechanism andoperable to sever all of thethrcads connected'to the work when thelatter is removed from the machine.

In the drawingsFi re 1 is a perspective view of a part'o a machine suchas illustrated in his application for patent above mentioned,illustratinthe operation of the upper thread-cutter w ran it is necessary to removethe' work where the seam cannot be run oi! the outer ed 0 of work; Fig.2 is a perspective view o the end of the work-arm of the machineillustratin the operation of the lower thread-cutter w ien it isnecessary to remove the work where the seam cannotbe run oil the outeredge of work; Fi 3 is a perspective view of the machine, at t e and ofand above the work-arm, illustrating the mechanism operating at thispoint; Fi 4 is a lan view (with parts in section) 0 the mec ianism shownin Fig. 3; Fig. 5 is, a vertical sectional view throu h the end of thehollow work-arm showin t 1e mechanism operatin within the same. ig. 6 isa detail view 5 owing part of an arm $100") of the frame of the machinewith the used member of the upper thread-cutter sccured thereto,

The sewing-machine to which the threadcutters of his present inventionare applied, is adapted tojform', by a single operation" the scamconstituting the subject-matter of 1118 United States Letters-Patent No.883,614, dated March 31st, 1908; said scam is also illustrated anddescribed in his above-montioned patent application Sr. No. 347,649,filed December 13, 1906.

40 is the end of a hollow work-arm of the machine, said arm terminatingbelow overhanging parts of the stitch-forming and other mccianism, asshown in Fig. 3.

100", Figs. 3 and 4, is a ri id arm extendmg from the frame-work Tnotshown) of the machine.

85 is a vertically movable hollow presscrfoot bar extending downwardthrough hub 216 (Fig. 3) of prcsscr-foot 26 and into a bearing in arm100". Means not shown, rigidly secure the presscr-foot to bar 85. Theparticular construction of the presserfoot forms no part of the presentinvention, and hence does not require explanation herein,

100" is a plate secured to arm 100" by two screws 100. A screw 304 onthe presser-foot works in a slot 305 in plate 100 and assists in guidingthe resser-foot in its vertical movements. At its forward end theprcsscrfoot is notched or bifurcated forming two toes 26 and 26 searated bv a s ace in which the upturned edges of worc to be trimmedadvance to the trimmer blades 00 and 87, 00 being a fixed blade securedin too 26 of the prcsscr-foot, and 87 being a movable blade.

111 is a work-guide and trimmings deflector, secured to toe 26 by ascrew 114 and adjusted to different positions by a lover 115.

84 is a sleeve or hollow shaft surrounding and rotatable about thehollow presscr-foot bar 85-and terminatin above the hub 216 of theresser-foot. A cut arm 84 depends from the lower end of trimmer-sleeve84 and has the movable trimmer blade 87 secured thereto. Through drivingconnections (not shown) to the upper end of trimmersleeve 84, the latteris oscillated about bar 85, swinging the arm 84 and reciprocating blade87.

Four needles, 1, 2, 3", and 4", are secured together to the lower end oftho needle-bar, only a part of which is shown in Fig. 3.

80 is a cross-thread carrier secured to the lower end of a shaft 78which depends from suitable bearings (not shown) in the frameter is castintegral with plate 100.

nections (also {not shown) oscillate-said shaft and its.thread'carrier.Y

101 is 'a cross-thread-hook secured to the lower end of a short verticalshaft 99, journaled in a tubular bearing 100, which lat- 98 (Fig. 4) isa short crank-arm secured by a set-screw to the upper end of shaft 99,and connected by a link 96 toga crank arm84" on trimmer-sleeve 84.Through these connections oscillation of sleeve 84 oscillates,

shaft 99 and the cross-thread hook 101.

28, Figs. 1 and 5, is a throat-plate secured in an opcnin in the upperside of the end of the wow-arm, by a screw 28* (Fig. 5).

20 is the feed-surface, comprising rows of teeth adapted to work 11 wardthrough slots in the throat-plate, and having a foot 165 through which ascrew 165 passes to secure thefeed-surface to the end of a feedlever159, which lever is actuated by driving connections. (not shown) to imart the desired movement to the feed-sur ace.

14 (Fig. 5) is a loop spreader adapted to be oscillated in a horizontalplane by its connection to theend of feed-lever 159.

6", Fi 5, is one of a gang of four loopers arrange side by side on alooper-carrier 183 at the end of a looper-lever 177. Suitable drivingconnections (not shown) to the' other end'of the looper-lever, impart tothe loopers suitable elliptical movement in a horizontal plane.

In the operation of the machine, the elements above described cotiperateto trim the two upturned edges of a pieceof fabric, such as 30, Fig. 3,and to then connect said trimmed edges by threads in such manner as toform the seam heretofore referred to. The upper or needle side of suchseam is shown in Figs. 2 and 3, the cross-thread 5 being looped backwardand forward beneath the stitches in the needle-threads.

The above descri tion of the stitch-forming elements will acilitate anunderstanding of the thread-cutters which will now be described.

The provision of special means for cutting or clipping the threads isparticularly desirable to facilitate removal of the work when it is notdesirable to continue the scam to the outer edgeof the work. To leavesufiicient lengths of thread-ends through the four loopers, such as 6,the eye 5" of thread-carrier 80 and the eyes of needles 1", 2, 3, 4, itis desirable that, the thread-cutters shall operate to pull offsufiicient thread .and clip the 'threadsat point-s toleave the desiredlength of thread-ends. In the. drawings I have shown anjupper threadcuttcr230 and a lower thread-cut or. The. latter consists-of a bar 235bent at one end to formia finger grip 288 (Fig. 2) and 1,os1,ess v V atthe other end having a right-an le blade 241 having a shearin edge 241an a sleeve 236 through which latter a. horizontal rod 237 passes (Figs.1 and 2). This threadcutter bar 235 is longitudinally movable in agroove or depression in the top of cover 40 and is guided by said groove,and by its engagement with rod 237 which constitutes a earing'on whichthis thread-cutter is mounted to turn and also move longitudinally. Whennot in use the blade takes the position shown in Fig. 5, and lies in atransverse recess or depression 241 in cover 10, being held in thisposition by a spring 239, Fig. 2, which bears against bar 235 along itsinner edge, and thus tends to constantly hold the blade 241 in contactwith the surface of the work-arm beneath said blade.

To sever the threads and remove work from beneath the resser-foot, themachine is stopped with tile needles elevated. In the normal relation ofthe parts the teeth of the feed surface will under these conditionsproject above the throat-plate. Through connections which need not behere explained, the lifting of the resser-foot (by means not shown) willsimul the feed-surface below the surface of the throat-plate. Thereuponthe operator by means of grip 238 ushes the thread-cutter forward,causin, b ade 241 to advance up an inclined sur'ace 242 (Figs. 2 and 5)at the front end of recess 241" and along the surface of the throatlatebeneath the work, gathering in front 0 it the threads extendmg downwardfrom the work and pulling oil lengths of the threads suflicient to formloops around the edge of blade 241. In Fi 2, I have shown the blade 241as thus pulling off loops in the four looper threads 6, 7, 8 and 9 only;but as the blade 241 will in its advance also encounter the four needlethreads, each extending downward from the work in a loop around itscorrcs onding loopcr and upward through the wor: to the eye of theneedle, it follows that the blade will also pull of? lengths of theneedlethreads sufficient to form loops (illustration of which in thedrawings would involve much confusion) around the edge thereof. When theblade 241 passes the end of the throat-plate, the pressure of the spring239 (Fig. 2) causes it'to dro into a transverse recess 248 (Figs. 2 and5) in which position its further movement causes its cutting edge 241 toact against the cutting edge of a blade 244 fixed by screws 2A5, therebysevering all of the threads which were gathered up b the blade 241, orin other words, all threa extendin from the underside of the work. Theon s of looper-threads 6, 7

8 and 9 thusscvcred would extend upwar from the loopers through thethroat-plate andalong the utter beneath the presser-foot.

The time severed ends of the needle-threads 130? d 2, 3 and4 wouldextend from the needlein sleeve orhub232 which latter is a part of itscutting edges this thread-cutter is screws, as'shown in Fig. 6, passingthrough eyesdownward through the work and along the throat-plate beneaththe resser-foot. Hence if this thread-cutter be alone relied upon to cutthe needle-threads, withdrawal of the work will cause the ends of saidthreads to be drawn through the work.

For thepurpose of cutting the needlethreads 1, 2, 3 and 4, and thecross-thread 5, above the work, when for example it is desireditoterminate the seam and remove the work before the edge of the fabric orwork is'reached, a thread-cutter 230 is provided. It consists of ablade. having cutting edges 230 230? (Fig. 42) secured to the lower endof a vertical stud 231. free to'turn of plate 100 (Fig. '3). Atthe outerends slightly hooked, so that when the needles, resser-foot and otherparts are raised, and the cutter swung around in front of the needle andcross-threads, as shown in Fig. 1, said threads are gathered in by theacting cuttingfledge and pulled back under the end of chaining-foot 25and over the work, thereby forming loops of these threads around thecutting edge until the threads contact with the edge of blade 233 (Fig.1), when" the threads are sheared or cut off, leaving ends through theneedles and cross-thread looperv 80 of suflicient length to start thenext seam. Blade 233 is fixed to the underside of the frame-arm 100(Fig- 3) by the openings 233, (Fig. 1). In Fig b, the plate 100,attached to arm 100?, .tsron itted,

What I claim is: a f

1. In a-sewing' machine,the' combination j with... stitch Q formingmechanism including one or more needles, of a work 'supportlngarm havinga free end at which said stitchforming mechanism operates, apresser-foot and a throat plate, and a threadcutter mounted on a bearingon the work-arm and 45 normally in a position clear of the space betweenthe resser-foot and the throatplate but movable on said bearing totraverse the space between the presser-foot and needle or needles (whenelevated) and the throat-plate to sever thread extending from the-workin the'path of said thread-cutter. 2. In a sewing machine, thecombination with stitchforming mechanism includin one or more needles,of a work-arm forme with a recessin its outer surface and athread-cutter mounted on. said work-arm and normally positioned in saidrecess but movable upward out of the recess and along the arm to severthread connected to the work. 1 a

3. In a sewing machine, the combination w-ith stitQ-iorming mechanismincluding one or more needles, offibrbanniomued with a recess in itsupper surface, and a thread cutter mounted 'on said workarm andincluding a blade extending transversely across the upper surface of theworkarm and normally positioned in said recess but movable upward out ofthe recess and Witnesses:

HERBERT E. MATHEWSON, JAMES C. COLLIN, Jr.

Cojiestf fiatent' may be obtained for five cents each, by addressing thef Commissioner of Patents, Washington, I 6- v

